//
//  WelcomeViewController.swift
//  Weibo
//
//  Created by 梁智 on 15/11/27.
//  Copyright © 2015年 lzfree. All rights reserved.
//

import UIKit

class WelcomeViewController: UIViewController {

    // 设置界面，视图的层次结构
    override func loadView() {
        view = backImageView
        
        setupUI()
    }
    
    // 视图加载完成之后的后续处理，通常用来设置数据
    override func viewDidLoad() {
        super.viewDidLoad()

        // 异步加载头像
        iconView.sd_setImageWithURL(UserAccountViewModel.sharedUserAccount.avatarUrl, placeholderImage: UIImage(named: "avatar_default_big"))
    }

    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        
        // 在运行循环结束前，调用 layoutSubviews 函数`统一`设置 frame
        iconView.snp_updateConstraints { (make) -> Void in
            make.bottom.equalTo(view.snp_bottom).offset(-view.bounds.height + 200)
        }
        // 动画
        welcomeLabel.alpha = 0
        UIView.animateWithDuration(1.5,
            delay: 0,
            usingSpringWithDamping: 0.8,
            initialSpringVelocity: 10,
            options: [],
            animations: { () -> Void in
                self.view.layoutIfNeeded()
            }) { (_) -> Void in
               
                UIView.animateWithDuration(2.0, animations: { () -> Void in
                    self.welcomeLabel.alpha = 1.0
                    }, completion: { (_) -> Void in
                        // 发送通知
                        NSNotificationCenter.defaultCenter().postNotificationName(WBSwitchRootViewControllerNotification, object: nil)
                })
        }
    }

    // MARK: - 懒加载控件
    /// 背景图像
    private lazy var backImageView: UIImageView = UIImageView(imageName: "ad_background")
    /// 默认头像
    private lazy var iconView: UIImageView = {
        
        let iv = UIImageView(imageName: "avatar_default_big")
        
        iv.layer.cornerRadius = 45
        iv.layer.masksToBounds = true
        
        return iv
    }()
    /// 欢迎标签
    private lazy var welcomeLabel: UILabel = UILabel(title: "欢迎归来", fontSize: 17)
    
}

// MARK: - 设置界面
extension WelcomeViewController {
    
    private func setupUI() {
        
        view.addSubview(iconView)
        view.addSubview(welcomeLabel)
        
        
        iconView.snp_makeConstraints { (make) -> Void in
            make.centerX.equalTo(view.snp_centerX)
            make.bottom.equalTo(view.snp_bottom).offset(-200)
            make.width.equalTo(90)
            make.height.equalTo(90)
        }
        
        welcomeLabel.snp_makeConstraints { (make) -> Void in
            make.centerX.equalTo(iconView.snp_centerX)
            make.top.equalTo(iconView.snp_bottom).offset(16)
        }
    }
}
